The invasion of unwelcome species can be stopped at all of the following points except

(a.) before reproduction

(b.) after they are found

(c) before the introduction

(d) after they are established

Option D

Explanation:

The unwelcome species or the invasive species can be stopped by entering into a new place by killing them at proper time.

They can be prevented from entering into a new place by various means, they can also be stopped from reproducing and giving birth to new ones so that they cannot conquer the area.

They can be killed once they are found and these are some of the ways by which they can be prevented from entering into a new place.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.